REPRODUCTION 



57 



When the gemmae become detached they develop into typical 

 liverworts. If a thallus is broken into several parts, each 

 part will develop into an independent plant. 



FIG. 24. Marchantia thallus, showing bifurcating tips and diamond- 

 , shaped areas of the upper surface. 



2. Sexual Reproduction. There are two types of sexual 

 organs, (a) Antheridia and (b) Archegonia, which in Marchan- 

 tia occur on separate individuals. 



